I had a great start in life and then couldn't follow through. In my twenties I had a string of jobs, each lasting less than 6 months. I got diagnosed with ADHD at the start of my thirties. It explains a lot.
Now I'm stuck watching my former classmates with their successful careers while I try to scrape together $400 for rent. Staff engineers at Google, CTOs of companies and so on. They likely make more in a year than I'll make in my lifetime. It feels bad.
I think a lot of advice on this topic will focus on how to get successful. How to get the job. How to get the house. I think that's the wrong way to go about it. Focus on the small things you already have, however tiny. Actively seeking out the joy in the mundane, everyday things is a great start (and however much money and success you have, your everyday life is usually quite mundane).